Cyanophenyl esters of oxime-o-carbonic acid

ABSTRACT

Cyanophenyl carbonates are prepared and used as herbicidal agents and as potentiating mixtures for their herbicidal effect.

United States Patent n 1 Boroschewski et al.

CYANOPHENYL ESTERS OF OXIME-O-CARBONIC ACID Inventors: Gerhard Boroschewski; Reinhold Puttner; Friedrich Arndt, all of Berlin, Germany Assignee: Schering Aktiengesellschaft, Berlin and Bergkamen, Germany Filed: Feb. 26, 1973 Appl. No.: 335,662

Foreign Application Priority Data [451 July15, 1975 [56] References Cited UNITED STATES PATENTS 3,624,091 11/1971 Daum et al. 260/463 3,641,062 2/1972 0st at al. 260/463 OTHER PUBLICATIONS Chemical Abstracts, Vol. 78,";2 9461 X, (1973).

Primary ExaminerDonald G. Daus Assistant Examiner-Diana G. Rivers Attorney, Agent, or Firm-Joseph F. Padlon 57 ABSTRACT I Cyanophenyl carbonates are prepared and as herbicidal agents and as potentiating mixtures for their herbicidal effect. 4

12 Claims, N0 Drawings 1 CYANOPHENYL ESTERS OF OXlME-O-CARBONIC ACID The invention relates. to new cyanophenyl carbonates, processes for the production thereof, and herbicidal agents containing cyanophenyl carbonate compounds and their potentiating mixtures with other active substances.

Halogen-substituted benzonitriles with herbicidal effect are already known. One of their most important representatives is 3,S-diiodo-4-hydroxy-benzonitrile of German Patent No. 1,266,563. This active substance and its derivatives have, however, the disadvantage of insufficient effect, in particular toward the millet speciesEchinochioa crus galli occurring in rice cultivations.

It is therefore a specific object of the invention to develop a weed killer suitable to control the millet species Ec h inochioa crus galli. It has now been found that compounds of the general formula in which R and R are identical or different and represent a possibly monoor polysubstituted aromatic, ali phatic, cycloaliphatic or araliphatic hydrocarbon radical,

R additionally hydrogen,

R and R jointly with the carbon atom, a possibly monoor polysubstituted cycloaliphatic hydrocarbon radical, and

X and Y represent an identical or different halogen atom,

are herbicidal and exert an excellent effect in particular toward the millet species Echinochioa crus galli.

It must be rated as a particular advantage here that this weed can be combated without damage to the rice plants.

The effect of these compounds extends moreover to other weeds, such as Stellaria media, Senecio vulgaris, Lamium amplexicaule, Ipamoea purpurea, Polygonum lapathifolium, Centaurea cyanus, Amarantus retroflexus, Chrysanthemum segetum, Setaria italica, Sinapis sp. and Solanum sp.

It has also been found that compounds according to the invention exhibit excellent selective properties also for the cereals wheat, barley, rye and oat.

The quantities to be used are, depending on the area of application and type of weed, about 0.25 to 3 kg active substance per hectare.

By the halogen substituents of the phenyl radical marked X and Y in the general formula that iodine, chlorine and bromine atoms are meant and the substituents are preferably identical.

For R and R there enter into consideration aromatic hydrocarbon radicals, for example, the phenyl or naphthyl radical, the aliphatic hydorcarbon radicals with l to 12 carbon atoms, such as methyl, ethyl, propyl, isopropyl, butyl and others; cycloaliphatic hydrocarbon radicals with 5 to 8 carbon atoms, such as cyclohexyl and others, and as araliphatic hydrocarbon radicals, for example, benzyl or phenylethyl and others, these radicals possibly being for example equally or differently substituted by low alkyl radicals, such as methyl or ethyl, the halogen atoms, such as chlorine or bromine, low alkoxy radicals, such as methoxy or ethoxy and others.

R and R may also form a cycloaliphatic 5- to 8-.

member ring, for example, cyclohexyl or cyclooctyl and others, which may possibly be monoor polysubstituted by low alkyl radicals, such as methyl, or other groups.

It has further been found that mixtures containing at least two non-identical compounds of the defined general formula above exhibit an effect which is higher than the effect of the individual components at equal concentrations of application.

Such mixtures show, for example, in quantities of use which are still at the minimum limit of action of the in-.

dividual components, a sufficient action against weeds that are not controlled with corresponding quantities of the single components of the mixtures according to the invention.

The mixture ratio of the single components in the mixtures may vary within wide limits and depends on the desired control, on the type of weeds to'be controlled, or plants not wanted; the age of the weeds or plants, the prevailing weather conditions, and the technique of application. It is therefore not possible to state from the beginning a certain mixture ratio which would suffice for all possibilities equally, although on the other hand the found effects are not strictly dependent on certain mixture conditions. By corresponding preliminary tests, however, the specialist is easily able to determine the best mixture ratio for the intended purpose. In general, the mixture ratio for a two-component mixture may be about 4:1 to about 1:4, preferably about 1:2 to about 2:1.

The compounds of the invention can be used, however, not only alone or as mixture of several active substances, but also as an admixture with other plant protecting agents or pesticides, such as, insecticides, fungicides or according to the desired purpose, with other agents.

If, for example, a broadening of the sprectrum of action is intended, other herbicides may be added, in which case frequently synergistic effects occur.

It has further been found that by combination of the compounds of the invention with growth-substance herbicides with phenoxycarboxylic acids or phenoxycarboxylic acid amides, with ether compounds, in particular, substituted diphenyl ethers, substituted triazines, ureas or anilides for weed control in cereals and rice; the following improvements of the commercial herbicides are obtained: Enlargement of the range of action, higher effectiveness, greater independence of action from the growth stage of the weeds at time of treatment, and hence a general greater certainty of the herbicidal result, especially in spring application in winter cereals against weed greases and dicotyledoneal weeds.

As further effective mixture partners which are suitable, there may be used active substances from the following groups: carbamic acid and thiocarbamic acid esters, the substituted anilines, aminotriazoles, diazines, aliphatic carboxylic acids and halogen carboxylic acids, halogenated benzoic acids and phenylacetic acids, hydrazides, amides nitriles, benzimidazoles,

quinazolines, dipyridyl derivatives, substituted oxadiazines and oxadiazolines, substituted thiadiazoles and thiadiazines, benzoxazines, and growth regulators, such as 2-chlorethyl trimethyl ammonium chloride.

Depending on the purpose of application, other substances may also be added, for example, nonphytotoxic additions, which may result in a synergistic increase of action with herbicides, such as wetting agents, solvents, oily additions and others.

Appropriately, the active substances of the mixtures in the invention include preparations, such as powders, scatters, granulates, solutions, emulsions or suspensions, with the addition of liquid and/or solid vehicles or diluents and if desired, of wetting, adhesive, emulsifying and/or dispersing aids.

Suitable liquid vehicles are, for example, water, aliphatic and aromatic hydrocarbons, such as benzene, toluene, cyclohexanone, isophorone, also mineral oil fractions.

As solid vehicles which are suitable are the mineral earths, for example, siliceous clay, silica gel, talc, kaolin, attaclay, limestone, silicic acid, and plant products, such as flours.

Among surface-active substances that may be named are calcium lignin sulfonate, polyoxyethyle ne-octyl phenol ether, naphthalene sulfonic acids, phenol sulfonic acids, formaldehyde condensates, fat alcohol sulfates, and fatty acid alkaline or alkaline earth salts.

The proportion of the active substance or substances in the various preparations may vary within wide limits. The agents contain, for example, about 20 to 80 percent by weight of active substances, about 80 to 20 percent by weight of liquid or solid vehicles, and optionally up to 20 percent by weight of surface-active substances.

Application of the agents is effected in the usual mannerfnamely, with water as vehicle in liquid spray quantities of 100 to 1000 liters/ha. For total weed control also the partly common liquid spray quantities of more than 1000 liters/ha may readily be applied. Also an application of the agents in the so-called Ultra-lowvolume process is possible. In addition, the method of application-in microgranulate form may be used.

The defined new compounds are produced, for example, by reacting compounds of the general formula HO-- I) or their alkali salts a. with halogen forrnyl oximes of the general formula C=N-O-CO-Hal R 1 t with additionof a tertiary organic base, as for example triethylamine or N,N-dimethyl aniline, or

b. first with phosgen'e, appropriately with the use of an organic solvent, to the corresponding chloroformicacid ester of the general formula and causing the latter to react with an oxime of the general formula in the presence of an organic or tertiary organic base. such as triethylamine R' R' R",, R" having in the general formulas the meaning stated above of R, and/or R and Hal being a halogen atom.

The following examples are illustrative of the method of production of the compounds of the invention.

a. l-ethylethylidenamino-(2,6-diiodo-4-cyanophenyl) carbonate M.p.: 107-108 C (decomposition) Yield: 15.0 g 77% of the theory b. lsopropylidenamino-2,6-diiodo-4-cyanophenyl carbonate The sodium salt produced from 18.55 g (0.05 mole) 3,5-diiodo-4-hydroxybenzonitrile is suspended in 50 ml acetonitrile. While stirring, 6.75 g acetonoxime-O- carboxylic acid chloride are dropped in, the temperature rising to about 30 C. Stirring is continued for 45 minutes at 50 C. After cooling to room temperature, the product is poured on ice and the organic phase washed with dilute NaOH and water at 0 C. The product is dried with magnesium sulfate and concentrated under reduced pressure. The residue is admixed with ml ether and the reaction product suction filtered. Mp: 167168 C (decomposition) Yield: 10.8 g 47% of the theory 'c. Isopropylidenamino-Z,6-dibromo-4-cyanophenyl carbonate To a solution of 13.85 g (0.05 mole), 3,5-dibromo-4- 'wtlroxybenzonitrile in 350 mlchloroform and 5.3 g -;(fs52 mole) triethylamine,.a solution of 7.1 1 g (0.052 2;oximinopropane-Ocarboxylic acid chloride in 50 ml ,chlorform is added drop by drop at 0 C while stirring within 15 minutes. Then stirring is continued for 3 hours at roorntemperature. To remove the triethylamine hydrochloride formed, the reaction mixture is washed three times with about 200 ml water each time. The chloroform phase is dried over magnesium sulfate, and the solvent removed under vacuum. The colorless, crystalline reaction product can be recrystallized from methanol.

Yield: 16.0 g 85% of the theory d. Isopropylidenamino-2,6-dichloro-4-cyanophenyl carbonate A solution of 8.83 g (0.065 mole) 2-oximinopropaneadded drop by drop to a solution of 11.6 g (0.062 mole) 3,5-dichloro-4-hydroxybenzonitrile in 250 ml chloroform and 6.56 g (0.065 mole) triethylamine while stirring at 0 C within minutes. Then stirring is continued for 3 hours at room temperature. To remove the triethylamine hydrochloride formed, the reaction mixture is washed three times with about 200 ml water each time. The chloroform phase is dried over magnesium sulfate, while the solvent is removed under vacuum. The colorless, crystalline reaction product can be recrystallized from methanol. M.p.: 96-98 C. Yield: 13.0 g 73% of the theory In the following table some additional compounds O-carboxylic acid chloride in ml chloroform is 15 made according to the invention, are listed LII Compound 3,3,5-trimethy1cyc1ohexene-(5)-y1idenamino- (2,6-diiodo-4-cyanpheny1)-carbonate 1-ethy1propy1idenamino-(2,6-diiodo-4-cyan' phenyl)-carbonate 1-sec.-butyl-ethy1idenamino(2.6diiodo-4 cyanphenyl)-carbonate 1-n-propy1ethy1idenamino-(2,6-diiodo-4- cyanphenyU-carbonate l-isopropylethylidenamino-(2.6-diiodo-4- cyanphenylycarbonate 1-methylpropylidenamino-(2,6dibromo4- cyanophenyl)-carbonate 1-methylpropy1idenamino-(2.6-dichloro4- cyanophenyD-carbonate 4-methylpenty1iden-2-amino-(2,6-dibromo- 4-cyanophenyl)-carbonate 1-isopropyl-2-methy1propy1idenamino (2,6-diiodo4-cyanopheny1)-carbonate l-isopropy1-2-methylpropylidenamino- (2,6-diiodo-4-cyanophenyl)-carbonate 1,2-dirnethy1ibuty1denamino-(2,6-diiodo- 4-cyanophenyl)-carbonate Z-ethyll methyl-butylidenamino-( 2,6-

7 diiodo-4-cyanophenyl)-carbonate 1-isobutyl-3-methy1butylidenamino- (2,6diiodo-4-cyanopheny1)-carbonate l-ethylhexy1idenaminc-(2,6-diiodo-4- cyanophenyl )-carbonate l-propylpentylidenamino-(2,6-diiodo- 4cyanophenyl)-carbonate ethy1-propy1idenamino(2,6-dibromo-4- cyanopheny1)-carbonate l,Z-dimethylpropylidenamino-(2,6-dibromo-4-cyanopheny1)carbonate methy1-buty1idenamino-(2,6 dibromo-4- cyanophenyl )-carbonate methylpentylidenamino-(2,6-dibromo-4- cyanophenylycarbonate propyl-butylidenamino-(2,6-dibromo 4-cyanopheny11-carbonate methy1-hepty1idenamino-(2,6-dibromo-4- cyanopheny1)-carbonate methylpenty1idenamino-(2,6-dichloro-4- cyanophenyl )carbonate 1.2,Z-trimethylpropylidenamino-(2.6- dihromo-4-cyanophenyl )-carbonate methy1-hexy1idenamino-(2,6-dibromo4- cyanophenyl)-carbonate methyl-hexylidenamino-(2,6-dichloro-4- cyanophenyl )-carbonate diisobutylmethylenamino-(2,6-dibromo- 4 cyano henyl)-carbonate l-ethyl- -met11y1penty1idenamino- (2.6-dibromo4-cyanophenyl )-carbonate cyclopentylidenamino-(2,6-dibromo-4- cyanophenyl)-carbonate cyc1oocty1idenamino-(2,6-dibromo-4- cyanophenyl )-carbonate methy1decylidenamino-(2,6-dibromo-4- cyanopheny1)-carbonare 3,5.5-trimethyI-Z-cyclohexenylidenamino-(2,6-dibromo-4-cyanopheny1)-carbonate 1-methyl-Z-phenylethylidenamino (2,6-

dibromo-4-cyanopheny1) arbonate 1-methy1-3-p11enylpropylidenamino- 2,6-dibromo-4-cyanopheny1)-carbonate 1(4-methoxypheny1)-ethylidenamino- (2,o-diiodo-4-cyanopheny1)-carbonate l l-tertl-buty1ethy1idenamino(2,6-diiodo-4-cyanopheny1) arbonate cyclohexylidenamino-(2,6-dibromo 4- cyanophenyD-carhonate Physical Constant M.P.: 151 152C M.P.: 102 104C M.P.: 92 94C M.P.: 115 117C M.P.: 82 83C M.P.: 69 70C M.P.: 71 72.5C

M.P.: 91 93C M.P.: 117 119C M.P.: 115 117C M.P.: 120 122C M.P.: 108 110C M.P.: 50 52C M.P.: 102 103C M.P.: 71 72C M.P.: 94 97C M.P.: 69 72C M.P.: 58 62C M.P.: 117 118C M.P.: 134 137C M.P.: 118C M.P.: 134- 142C M.P.: 110- 111C M.P.: 142 144C M.P.: 117 119C M.P.: 9s -C M.P.: 108C Compound Physical Constant 37. 1-methyl2-methyl-buty1idenamino- M.P.: 87C

(2,6-dibromo-4-cyanophenyl)carbonate 38. diisopropylmethy1enamino-(2,6-dibromo- 4-cyanophenyll-carbonate M.P.: 92C

39. cycloheptylidenamino-(2,6-dibromo-4- cyanophenyl)-carbonate 40. Chlormethylphenylmethylenamino- (2,6-dibromo-4-cyanophenyl)-carbonate 41. 1-ethylhexylidenamino-(2,6-dibromo-4- M.P.: 98 101C M.P.: 148 151C 45. isopropy1idenamino-(2-bromo-6-iodo-4- cyanophenyl)-earbonate 46. isoprop lidenamino-(2-chloro-6-iodo-4- cyanop eny1)-carbonate 47. isopropylidenamino-(2-chloro-6-bromo M.P.: 158 159C M.P.: 149 151C 4-cyanophenyl)-carbonate M.P.: 121 123C 48. 1-benzoylethylidenamino-(2,6-diiodo- 4-cyanopheny1)-carbonate M.P.: 110 111C As is evident from the table, the compounds according to the invention proved clearly superior to comparatively tested standard agents in the herbicidal action They are colorless and odorless, usually crystalline substance. They are insoluble in water and benzine and more or less soluble in acetone, tetrahydrofurane, cy-

clohexanone, isophorone and dimethyl formarnide.

The starting products of the compounds according to the invention are known or can be produced by meth- 25 on millet and in the compatibility for rice.

ods known in the art for example as foll Compounds according to the invention Rice Millet e. Chloroformic acid-2,6-diiodo-4-cyanophenyl ester 30 1. lsopropylidenamino-2,6-diiodocyanophenyl-carbonate 1 0 135.6 g (0.366 H1016) 3,5-dHOdO-4- 2. 3,3,S-trimethylcyclohexene-()-ylidenamino-(2,6-diiodo-4-cyanophenyl)-carbonate 1 hydroxybenzonitrile are suspended in a solution of 26 3 l ethylpmpyndenamino (2,6 diiodO 4 ml phosgene In 500 ml acetic ester whne stirring, a socyanophenylycarponatel 10 0 lution of 46.5 ml N,N-dimethylanil1ne in 500 ml acetic lfil yl na iiodoester is dropped in at 0 to +5 C. Then the temperature 35 :gsrggggxggggzza O is raided to 45 C within minutes and stirring is concyanophenyl )-carbo nate 10 0 tinued at this temperature for minutes. After cooling lg zg ggfmfzgfgg's 10 0 to room temperature, the product is filtered, the filtrate 7. l-isopropylethylidenamino-(2,6-diiodo-4- 0 cyanopheriyl )-c arbonate l0 0 poured on ice, and the organic phase washedat 0 C 8. isopropyfidenmim (2.6 dibmm 4 with dilute hydrochloric acid and water. It is dried with cyanophenyD-carbonate l0 2 magnesium sulfate and concentrated under reduced P PY cyanophenyl)-carbonate 10 2 pressure. The residue crystallizes on addition of 500 ml 10, 1 memylpmpyndenamino-(2,6.dibmm0.4 pentane. cyanopheny1)-carbonate 1O 2 M P 5 15 C 11. 4-methylpentyliden-2-amino(2,6-dibromo-4- cyanophenyl)-carbonate 10 4 Yield: 122.7 g 78% 0f the theory 12. 1isopropy1-Z-methylpropylidenamino- The production of the preparations of the com- 13 1O 1 pounds according to the invention, ready for use, and (2,6-diiodo-4-cyanophenyl)-carbon ate 10 0 their mixtures, can be carried out in a well known manii iggg g g ffgiggfig m l ner, as by mixing or grinding processes. -lf desired, the i5. 2-ethyl-l-methyl-butylidenamino-(2,6- single components may be mixed just before they are l p y E 10 1 l6. 1-isobutyl-3-methylbutylidenaminoused, as is done in the practice for example in the so- (2,6 dfiodo,4 cyanopheny|) carbonme 10 I called tank mixing process. y y i naggno-(2,6-diiodo-4- I cyanop eny )-car nate 10 O The following examples will illustrate the herbicidal 1 propylpemyfidenamino (2 diiodo 4 action of the compounds of the invention and their cyanophenyl)-carbo nate 10 2 mixtures 19. ethyl-propylidenamino-(2,6-dibromo4- cyanophenyl)-carbonate 1O 2 20. 1.2-dimethylpropylidenamino-(2,3- EXAMPLE 1 '2] dibi-orrlicg4t-ciygnophenylcgizoiate 4 10 1 In the greenhouse, mlllCI(ECh11'l0ChlO8 crus galli) gi g s g' 1 mm 10 l and water rice were seeded in earth-filled pots. 22. methylpentyllidenzgaiino-(2,6-dibromo-4- 1O 3 cyanopheny )-car nate After emergence of the millet and rice plants, they 23' propyl bulylidenamino (26 dibrm0 4 were allowed to grow to the 23 leaf stage. Then SE1" cyanophenyl):carbon ate l0 2 face spraying was done with the active substances v cyanophenyl)-carbonate l0 3 below in a quantity of 1 kg active substance pet 25 1. thyl-3-methylpentylidenaminoare, suspended or dissolved in 500 liters of water 1 A6 i m-q p lilz y -F l0 4 q 2 -me y- -p enye yi enamiriohectare. Two weeks after the treatment, the degree of (Ladibmmoi'wanwhenfl) carbonate l0 1 damage of the plants was rated according to the rating 27. -gnfitgyl-3- kienyl roplylidigiamigw 10 l C n l romo- -cyanop eny -car onate scheme 0 10, where 0 means totally destroyed and l (4 methoxyphenylRmyfidenamimy 10 not damaged. (2,6-diiodo-4-cyanophenyl)-carbonate 1O 0 cyanophenyD-carbonate Compounds according to 1nvent1on isopropylidenamino-Z,

6-diiodo-4-cyanophenyl carbonate 3.3,5-trimethylcyclohexene-(S )-yiidenamino- (2.6-diiodo-4-cyanophenyl) carbonate l-ethylpropylidenamino- (2,6-diiodo-4-cyanophenyl) carbonate l-sec.butyl-ethylidenamino-(2,6-diiodo-4- cyanophenyl) carbonate l-n-propylethylidenamino-( 2,6-diiodo-4- cyanophenyl) carbonate l-ethyl-ethylidenaminq- (2,6-diiodo-4-cyano- Q. phenyl) carbonate l-isopropylethylidenamino-(2,6-diio4- cyanophenyl) carbonate 1sopropylidenamino- (2,6-dibromo-4-cyanophenyl) carbonate isopropylidenamino- (2,6-dichloro-4- cyanophenyl) carbonate isomethylpropylidenamino-( 2,6-dichloro- 4-cyanophenyl) carbonate l-benzoyiethylidenamino-(2,6)-diiodo- 4-c anophenyl) car onate methylpentylidenamino-( 2.6-dichloro- 4-cyanophenyl) carbonate 1,2,2-trimethylpropylidene-arnino- (2,6-dibrqmo-4 cyanophenyl) carbonate .rnethyl-hegtylidenamino-( 2.6-dibromo- 4-cyanophenyl) carbonate methylhexylidene 4-cyanophenyl --f carbonate cyclope'ntylidenamino-( 2,6-dibromo- 4-cyanophenyl) carbonate cyclooctylidcnarnino- (2,6-dibromo-4-canophenyl) carbonate Reference 115cm 3,5-diiodo-4-hydroxy-benzonitrile l0 l0 Untreated l0 l0 0 totally destroyed 10 not damaged EXAMPLE 2 The plant species listed in the table were treated in post-emergence with the agents to be used according to the invention in dosage of 1 kg activesubstance per hectare. The agents were sprayed uniformly as aqueous emulsion in 500'liters per hectare.

This test shows the excellent effect of the compound according to the invention on important weedscornbined with good compatibility for wheat, barley, rye and oat. 4

10 10 10 10 o o o 0 0 0 o o 0 0 10 10 10 1o 0 0 0 0 0 o 0 o 0 o 10 10 10 10 0 0 o 0 o o 0 o 0 0 1o 10 10 10 0 0 0 o 0 o. 0 o 0 0 10 10 1o 10 0 0 0 0 o 0 0 0 o 0 1o 10. 10 1o 3 o o, 4 0 4 0 o 1 0 10 1o 10 1o 0 0' o o o 0 ofo o Compounds according to invention a b Legend a Wheat h= Lumium amplexicaule b Barley i= C enlaureu cyanus c Rye j=Amarantus retmflexus d Oat k= Chrysanthemum segerum l= Polygonum lapathifolium m= lpomoea purpurea n G (Ilium aparine e S tel/aria media f= S enecio vulgaris g= M atricariu c/mmomilla 0 totally destroyed I0 not damaged EXAMPLE 3 In the greenhouse, the plants listed below were treated with the compounds according to the invention and their mixture in a dosage of 0.3 kg active substance per hectare. The agents were sprayed on the plants uniformly as aqueous emulsions at 500 liters per hectare. Twelve days after the treatment, the mixture showed a clearly better effect than the single components.

Active substance Mix-' Quantity Stell- Gent- Galium Matri or ture used aria aurea aparcaria Mixture Ratio kg/ha media cyanus ine cham.

l. isopropylidenamino- 2,6-diiodo-4-cyanophenyl carbonate (l) 0.3 4 8 8 4 2. 3,3,5-trimethylcyclohexene-(5)-ylidenamino-(2,6-diiodo-4- cyanophenyl) carbonate 0.3 5 I 5 0 ("l l ll lzl 0.3 2 0 l 0 Untreated l0 l0 l0 0 0 totally dcstroycd IO not damaged EXAMPLE 4 2-chloro-4,6-diethylamino-l ,3,5-triazine (IV) (Ill) 65 Furthermore, additional plants were treated with mixtures of these known agents stated in the table with isopropylidenamino'2,6-diiodo-4-cyanophenyl carbonate (A). The quantity used was again 0.3 kg total active substance per hectare.

The agents were sprayed on the plants uniformly as aqueous dispersions at 500 liters water per hectare. Eighteen daysafter the treatment, the degree of damage of the plants was determined and rated according to the rating code 0 10 with O totally destroyed and 10 not damaged.

Active sub- Mixture stance or ratio mixture Wheat Barley Rye Oat a b c d e f g h I l 10 l0 l0 3 7 l 3 l ll l0 l0 l0 l0 3 5 l0 1 5 3 5 8 Ill l0 l0 l0 l0 3 5 l0 2 4 2 2 9 IV 8 8 8 8 0 0 5 2 0 2 O 5 l A 111 l0 l0 l0 l0 0 O 0 O 0 0 0 II A H 10 l0 l0 l0 0 O 5 O O O O 0 Ill A lzl l0 l0 l0 l0 0 0 8 O 0 O O 5 W A 1:] 9 9 9 9 O 0 O O O 0 0 0 Untreated l0 l0 l0 l0 l0 l0 l0 l0 l0 l0 1O 10 0 totally destroyed 10 not damaged Legend I a== Smaprs sp. e=Amarantus retroflexus b=Seneci0 vulgaris f lpomoea purpurea c= Matricaria chamomiila g= Polyganum lapathifoli'um d= Centaurea cyanus h= Chrysanthemum segetum We claim: 4. A compound of the formula set forth in claim 1 1. Compounds having the formula: and is 1-ethylpropylidenamino-(2,6-diiodo-4- cyanophenyl) carbonate. 5. A compound of the formula set forth in claim 1 X and is 1-sec.-butyl-ethylidenamino-(2,6-diiodo-4- cyanophenyl) carbonate. R1 C N O C 0 CN 6. A compound of the formula set forth in claim 1 2 and is l-n-propylethylidenamino-(2,6-diiodo-4- i cyanophenyl) carbonate.

7. A compound of the formula set forth in claim 1 and is 1-ethyl-ethylidenamino-(2,6-diiodo-4- cyanophenyl) carbonate.

8. A compound of the formula set forth in claim 1 and is l-isopropylethylidenamino-( 2 ,6-diiodo-4- cyanophenyl) carbonate.

9. A compound of the formula set forth in claim 1 and is isopropylidenamino-2,6-dibromo-4-cyanophenyl carbonate.

10. A compound of the formula set forth in claim 1 and is isopropylidenamino-2,6-dichloro-4-cyanophenyl carbonate.

11. A compound of the formula set forth in claim 1 and is 1-methylpropylidenamino-(2,6-dibromo-4- cyanophenyl) carbonate 12. A compound of the formula set forth in claim 1 and is l-methylpropylidenamino-(2,6-dichloro-4- cyanophenyl) carbonate. 

1. COMPOUNDS HAVING THE FORMULA:
 2. A compound of the formula set forth in claim 1 and is isopropylidenamino-2,6-diiodo-4-cyanophenyl carbonate.
 3. A compound of the formula set forth in claim 1 and is 3,3,5-trimethylcyclohexene-(5)-ylidenamino-(2,6-diiodo-4-cyanophenyl) carbonate.
 4. A compound of the formula set forth in claim 1 and is 1-ethylpropylidenamino-(2,6-diiodo-4-cyanophenyl) carbonate.
 5. A compound of the formula set forth in claim 1 and is 1-sec.-butyl-ethylidenamino-(2,6-diiodo-4-cyanophenyl) carbonate.
 6. A compound of the formula set forth in claim 1 and is 1-n-propylethylidenamino-(2,6-diiodo-4-cyanophenyl) carbonate.
 7. A compound of the formula set forth in claim 1 and is 1-ethyl-ethylidenamino-(2,6-diiodo-4-cyanophenyl) carbonate.
 8. A compound of the formula set forth in claim 1 and is 1-isopropylethylidenamino-(2,6-diiodo-4-cyanophenyl) carbonate.
 9. A compound of the formula set forth in claim 1 and is isopropylidenamino-2,6-dibromo-4-cyanophenyl carbonate.
 10. A compound of the formula set forth in claim 1 and is isopropylidenamino-2,6-dichloro-4-cyanophenyl carbonate.
 11. A compound of the formula set forth in claim 1 and is 1-methylpropylidenamino-(2,6-dibromo-4-cyanophenyl) carbonate
 12. A compound of the formula set forth in claim 1 and is 1-methylpropylidenamino-(2,6-dichloro-4-cyanophenyl) carbonate. 